diff options
| author | Uros Bizjak <ubizjak@gmail.com> | 2026-03-11 13:26:00 +0300 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2026-03-12 07:25:20 +0300 |
| commit | afeb96cb188d44a61033d838fda0acaa11d1ff24 (patch) | |
| tree | 25e687e3926128d243374a770d75f1adf0ef16cf | |
| parent | 2536091d585ac0b60ccf80cbe7a0bf4bfb75ec00 (diff) | |
| download | linux-afeb96cb188d44a61033d838fda0acaa11d1ff24.tar.xz | |
x86/hyperv: Use any general-purpose register when saving %cr2 and %cr8
hv_hvcrash_ctxt_save() in arch/x86/hyperv/hv_crash.c currently saves %cr2
and %cr8 using %eax ("=a"). This unnecessarily forces a specific register.
Update the inline assembly to use a general-purpose register ("=r") for
both %cr2 and %cr8. This makes the code more flexible for the compiler
while producing the same saved context contents.
No functional changes.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Long Li <longli@microsoft.com>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
| -rw-r--r-- | arch/x86/hyperv/hv_crash.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/hyperv/hv_crash.c b/arch/x86/hyperv/hv_crash.c index d0f95a278fdb..5ffcc23255de 100644 --- a/arch/x86/hyperv/hv_crash.c +++ b/arch/x86/hyperv/hv_crash.c @@ -204,8 +204,8 @@ static void hv_hvcrash_ctxt_save(void) ctxt->cr0 = native_read_cr0(); ctxt->cr4 = native_read_cr4(); - asm volatile("movq %%cr2, %0" : "=a"(ctxt->cr2)); - asm volatile("movq %%cr8, %0" : "=a"(ctxt->cr8)); + asm volatile("movq %%cr2, %0" : "=r"(ctxt->cr2)); + asm volatile("movq %%cr8, %0" : "=r"(ctxt->cr8)); asm volatile("movw %%cs, %0" : "=m"(ctxt->cs)); asm volatile("movw %%ss, %0" : "=m"(ctxt->ss)); |